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4x+43+5x+20=180
We simplify the equation to the form, which is simple to understand
4x+43+5x+20=180
We move all terms containing x to the left and all other terms to the right.
+4x+5x=+180-43-20
We simplify left and right side of the equation.
+9x=+117
We divide both sides of the equation by 9 to get x.
x=13
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